Milanese, Andressa Cecilia [UNESP]Hilario Cioffi, Maria Odila [UNESP]Voorwald, Herman Jacobus Cornelis [UNESP]Shigue, Carlos Yujiro [UNESP]2014-05-202014-05-202011-12-05Journal of Applied Polymer Science. Malden: Wiley-blackwell, v. 122, n. 5, p. 3168-3171, 2011.0021-8995http://hdl.handle.net/11449/9408This research presents the kinetic studies on the cure reactions of a new material, castor oil-based polyurethane resin. Thermal analysis by isothermal differential scanning calorimetry was used, as a variety of factors affect its cure, including formulation and polymerization process. The kinetic reaction of this catalyzed system is described by nth order equation. Castor oil, a vegetable triglyceride, was reacted with methylene diphenyl 4,4'-diisocyanate to produce an elastomeric matrix. The objective of this research is thermal characterization of new polyurethane that is less aggressive to humans and environment; therefore, castor oil used on the synthesis is derived from a natural and renewable resource. The activation energy measured for the castor oil-based polyurethane resin studied in this work was about 56 kJ/mol. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 3168-3171, 20113168-3171engactivation energycuring of polymerspolyurethanedifferential scanning calorimetrykineticsArtigo10.1002/app.34333WOS:000295538600038Acesso restrito61196710144161263511534795805776